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Finding the Fourth Proportional to 398.39, 549.74 and 223.73

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Solution

The fourth proportional to 398.39, 549.74 and 223.73 is: 308.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.39 : 549.74 = 223.73 : x
  2. Step 2: Convert to fraction form
    398.39/549.74 = 223.73/x
  3. Step 3: Cross multiply
    398.39x = 549.74 × 223.73
  4. Step 4: Simplify right side
    398.39x = 122,989.46
  5. Step 5: Solve for x
    x = 122,989.46/398.39
  6. Step 6: Final answer
    x = 308.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.